CVE-2026-68234

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: fix bo->pin leaking in amdgpu_bo_create_reserved

amdgpu_bo_create_reserved() only allocates a new BO when

*bo_ptr (struct amdgpu_bo **bo_ptr as input parameter) is

NULL, it simply skips creation when *bo_ptr is non-NULL.

But it unconditionally reserves, pins, gart allocates

and maps the BO afterwards.

When the same non-NULL BO pointer is passed in again,

for example firmware buffers that live in adev and are

re-loaded on every resume / cp_resume / start

under AMDGPU_FW_LOAD_DIRECT, amdgpu_bo_pin() just increases

pin_count unconditionally, however the matching teardown only unpins

once, so pin_count never drops to zero, so TTM is not able

to move, swap or evict a BO, causing BO leaks.

This commit fixes this issue by only pinning the bo

once at creation, and repeated calls no longer

take additional pin references.

(cherry picked from commit 3ddc0ae76202c447b6aec61e907b852bc94671cf)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References